<template>
	<view>
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" style="300px" :style="{height:wh+'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active': '']" @click=activechanged(i)>{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<scroll-view scroll-y="true" style="300px" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				
				
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 当前二级分类下的三级分类列表 -->
					<view class="cat-lv3-list">
						<!-- 三级分类下的item项 -->
						<view class="cat-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
								<!-- 三级分类的图片 -->
								<image  :src="item3.cat_icon"></image>
								<!-- 三级分类下的文本 -->
								<text>{{item3.cat_name}}</text>
						</view>
					</view>
					
				</view>
				
			</scroll-view>
		</view>
	</view>
</template>

<script>
	// 导入自己封装的 mixin 模块
	import badgeMix from '@/mixins/tabbar-badge.js'
	
		export default {
			 // 将 badgeMix 混入到当前的页面中进行使用
			 mixins: [badgeMix],
	
		data() {
			return {
				wh:0,
				cateList:[],
				active:0,
				//二级分类的列表
				cateLevel2:[],
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync();
			this.wh = sysInfo.windowHeight-50;
			this.getCateList();
		},
		methods:{
			//获取分类列表数据
			async getCateList(){
			const {data : res} = await uni.$http.get('/api/public/v1/categories')
			if(res.meta.status != 200){uni.$showMsg()}
			this.cateList = res.message
			this.cateLevel2 = res.message[0].children
			},
			activechanged(index){
				this.active = index
				//重新为二级分类赋值
				this.cateLevel2 = this.cateList[index].children
				this.scrollTop = this.scrollTop === 0 ? 1 :0
				
			},
			//跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
	}
	.left-scroll-view{
		width: 120px;
	}
	.left-scroll-view-item{
		background-color: #f7f7f7;
		text-align: center;
		line-height: 60px;
		font-size: 12px;
		&.active{
			position: relative;
			background-color: #FFFFFF;
			&::before{
				content: " ";
				display: block;
				width: 3px;
				height: 30px;
				background-color: #c00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}
	.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cat-lv3-list{
		display: flex;
		flex-wrap: wrap;
		.cat-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width: 60px;
				height: 60px;
			}
			text{
				font-size: 12px;
			}
		}
	}
</style>
